It looks like the 2023 Ford Super Duty will be an "all new" model that will be revealed at the Texas Auto Show, which is held from September 30-October 23 this year. That's not very specific on timing of the Super Duty unveiling, but at least it's something.
For me, who's waiting on order banks to open to put in for a 2023 model, the good news is that it's "all new." Here's hoping that that its actually got some updated features (interior) and not just "all new" paint color options.
https://texasautoshow.bigtex.com/fords-2020-lineup-in-the-virtual-automobile-building-truck-zone/